PT-2026-48941 · Mattermost · Mattermost

Winfunc · CVE-2026-7387 · Published 2026-06-12 · Updated 2026-06-18

Positive Technologies (AI Summary)

CVSS v3.1

8.8

High

Base vector

AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Mattermost versions prior to 11.6.2 Mattermost versions prior to 11.5.5 Mattermost versions prior to 10.11.17

Description Insufficient role-management authorization occurs when setting the scheme admin flag on group syncable link and patch endpoints. This allows a user with group-link permissions to escalate their own privileges and those of group members to team or channel administrator through crafted API requests.

Recommendations Update to version 11.6.2 or later. Update to version 11.5.5 or later. Update to version 10.11.17 or later.

Exploit

Fix

LPE

Incorrect Authorization

Weakness Enumeration

CWE-863

Related Identifiers

CVE-2026-7387

Affected Products

Mattermost

References · 6

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/7xxx/CVE-2026-7387.json · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2026-7387 · Security Note
• https://osv.dev/vulnerability/CVE-2026-7387 · Vendor Advisory
• https://mattermost.com/security-updates · Vendor Advisory
• https://t.me/CVEtracker/56730 · Telegram Post
• https://t.me/cveNotify/170362 · Telegram Post